Transmission drain pan



FIG. 1 is a top plan view of a transmission drain pan, showing my new design;

FIG. 2 is an end elevational view thereof;

FIG. 3 is a side elevational view thereof; and

FIG. 4 is a bottom plan view thereof.

The end and side not shown in the drawing are mirror images of the end and side shown in FIGS. 2 and 3 respectively. 

The ornamental design for a transmission drain pan, as shown and described. 